The invention relates to a device for mapping magnetizing characteristic curves of ferromagnetic materials and a mapping method thereof. The device comprises a hard magnetic sample, a soft magnetic sample, a case, a digital voltmeter UB, a UH, a power supply circuit of the UH, a waveband switch SB, connectors XS1/XP1-XS8/XP8, resistors Rx, Ry, a capacitor Cy and a panel. The mapping method comprises the following steps of switching on an electric source of the device, selecting the voltage input parameter of a signal generator and the mapping parameter of an oscillograph, demagnetizing the hard magnetic sample and the soft magnetic sample, scaling an X axis and a Y axis on the oscillograph and observing and mapping the fundamental magnetization curves and the magnetic hysteresis loops of the soft magnetic sample and the hard magnetic sample. The invention can respectively observe and map the dynamic magnetic hysteresis loops of the hard magnetic sample and the soft magnetic sample, is convenient for intuitively understanding and mapping the magnetizing characteristics of the hard magnetic sample and the soft magnetic sample, has high detection precision and compact structure and is used for researching the magnetizing characteristics of the ferromagnetic materials or electrical experiment teaching.